Stop it Carl, you'll make me regret going from an M3 to a 335d!
You've summed it up pretty well, and it sounds like you've got a good 'un. They can vary in power output. Did you do a lot of searching to find the right one?
It's the handling & road holding I miss the most - gives you so much confidence.
I've watched a supercharged E46 M3 at the Pod at BMW day a couple of years back. Not as quick as you might expect, about 13s / 110 if i remember correctly.
How do you find the LSD, or did you have it on your 335d? I know you got good 60' times in it. Is it a keeper or will you get that itch that needs scratching again soon - bit hard to know what to replace it with tho, for sensible money!